I have an account at playersonly.com they have been good for me so far. Have good lines and usually have somekind of contest/bonus action for free. I have also always recieved my payment checks. Let me know if you join because I can get a 10% referall on your initail deposit.
I go with http://www.sportsbook.com I haven't had any problems w/ them. Have some good free games (double your winnings, $25K NFL giveaway, etc) some I've actually won. There lines are good, sometimes i see 1/2 point difference. If you join give me a reference!